Rebaseline plugins/webview-plugin-lifecycle.html to verify flakiness status

The test is marked as failing, but the baseline right now is clearly wrong,
so maybe it's actually passing. TestExpectations may need to be re-added if
it turns out to still be flakey.

TBR=chrishtr@chromium.org
BUG=526594

Review-Url: https://codereview.chromium.org/2178553002
Cr-Commit-Position: refs/heads/master@{#407229}
1 file changed